Method and system for starting up an aircraft turbomachine by real-time regulation of air flow

a turbomachine and real-time regulation technology, applied in the direction of engine starters, machines/engines, turbine/propulsion engine ignition, etc., can solve the problems of significant increase of fuel consumption, vibrations that are particularly detrimental to the speed of rotation of turning parts, and the end of some blades of the rotor are at risk of rubbing against the casing,

Active Publication Date: 2014-12-25
AIRBUS OPERATIONS (SAS) +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0013]An object of the present invention is to prevent (or at least limit) such vibrations, which are very disadvantageous, caused by imbalance.

Problems solved by technology

During the restart, if the engine has not had time to cool sufficiently, the ends of some blades of the rotor are at risk of rubbing against the casing, or a blading will be slightly offset from its axis of rotation.
The rotation of incorrectly aligned turning parts of the engine leads to vibrations due to the imbalance.
These vibrations become particularly detrimental for some values of speed of rotation of the turning parts, that is to say the speed N2 of the compression rotor (high-pressure model) of a turbofan.
The aforementioned phenomenon causes a significant increase of the fuel consumption due to a loss of aerodynamic efficacy in particular of different elements of the engine, moreover irreversibly (wear of the ends of the blades).

Method used

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  • Method and system for starting up an aircraft turbomachine by real-time regulation of air flow
  • Method and system for starting up an aircraft turbomachine by real-time regulation of air flow

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Embodiment Construction

[0037]In accordance with one embodiment of the present invention, FIG. 1 illustrates a dispenser, generally indicated at 2 and having a tip structure 4, for mixing at least two separate streams of components into a combined fluid stream, such as a sealant, or tissue sealant or other combined fluid stream. Although the dispensers, systems and methods are generally illustrated and described in the context of a tissue sealant dispenser, it is understood that the present invention is not limited to such a dispenser or to the mixing of tissue sealant components, and that the present invention has applications in a variety of settings where mixing of component fluid streams is desired.

[0038]The start-up system 1 illustrating the invention and shown schematically in the FIGURE is intended to rotate a rotor 2 of a turbomachine 3 of an aircraft for the purpose of starting up the turbomachine 3.

[0039]In a preferred embodiment, said turbomachine 3 is an aircraft turbofan. Such a turbojet conve...

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PUM

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Abstract

The start-up system comprises a control loop, which regulates in real time the opening of a valve of an air feed of a start-up turbine based on the current measured speed of rotation of a rotor of the turbomachine and a predetermined speed value, said start-up turbine being capable of turning the rotor of the turbomachine for the purpose of the start-up.

Description

CROSS-REFERENCES TO RELATED APPLICATIONS[0001]This application claims the benefit of the French patent application No. 201356053 filed on Jun. 25, 2013, the entire disclosures of which are incorporated herein by way of reference.BACKGROUND OF THE INVENTION[0002]The present invention relates to a method and a system for starting up a turbomachine of an aircraft, in particular of a transport airplane.[0003]The invention applies to a start-up system of the type comprising:[0004]a ventilation source, in particular an axillary power unit (APU), which is able to produce an airflow and which comprises a compressor fed by an air intake circuit regulated by at least one controllable inlet valve; and[0005]a start-up turbine, which is fed by said ventilation source via a pneumatic connection and which is able to produce, when subjected to a fluid flow, a mechanical force making it possible to turn a rotor of the engine (turbomachine) of the aircraft for the purpose of the start-up.[0006]The en...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): F02C7/277
CPCF02C7/277
Inventor ZACCARIA, PATRICKCHAREYRE, PHILIPPEFERNANDEZ-LOPEZ, PIOCASADO-MONTERO, CARLOS
Owner AIRBUS OPERATIONS (SAS)
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